12020000121 has 6 divisors (see below), whose sum is σ = 17362222410. Its totient is φ = 8013333408.

The previous prime is 12020000087. The next prime is 12020000137. The reversal of 12020000121 is 12100002021.

It can be written as a sum of positive squares in only one way, i.e., 6615544896 + 5404455225 = 81336^2 + 73515^2 .

It is not a de Polignac number, because 12020000121 - 2¹⁰ = 12019999097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1335555569 = 12020000121 / (1 + 2 + 0 + 2 + 0 + 0 + 0 + 0 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (12020000521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667777776 + ... + 667777793.

It is an arithmetic number, because the mean of its divisors is an integer number (2893703735).

Almost surely, 2^12020000121 is an apocalyptic number.

It is an amenable number.

12020000121 is a deficient number, since it is larger than the sum of its proper divisors (5342222289).

12020000121 is a wasteful number, since it uses less digits than its factorization.

12020000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335555575 (or 1335555572 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12020000121 its reverse (12100002021), we get a palindrome (24120002142).

The spelling of 12020000121 in words is "twelve billion, twenty million, one hundred twenty-one", and thus it is an aban number.